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Split-spectrum processing with finite impulse response filters of constant frequency-to-bandwidth ratio

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1016/0041-624X(90)90090-B
AuteurRechercher : 1
Affiliation
  1. Conseil national de recherches du Canada
FormatTexte, Article
Sujetsplit-spectrum processing; clutter reduction; non-destructive testing; ultrasonic testing; signal processing
Résumé
A limitation to the ultrasonic non-destructive evaluation of materials with coarse structure is the poor signal-to-noise ratio caused by backscattering noise. Split spectrum signal processing, based on the decomposition of the ultrasonic signal by multiple narrow-band filtering, has been proved efficient for the suppresion of such noise. Its application, however, has been limited by the long processing time of the filtering process which uses discrete Fourier transforms. Here a new decomposition method is presented, based on finite impulse response filters of constant frequency-to-bandwidth ratio. This method is more efficient for split-spectrum processing of ultrasonic signals having wide frequency bandwidths or long time duration, and could be implemented in real-time with tapped delay lines. The choice of the optimal processing parameters is discussed theoretically and experimentally verified on ultrasonic data obtained from austenitic steel and graphite-epoxy samples.
Date de publication
Maison d’éditionElsevier
Dans
  • Ultrasonics 28, nº 4 : 229–240.
Langueanglais
Publications évaluées par des pairsOui
Numéro du CNRCNRCC 30134
NRC-IGM89AP-402-861-G
Exporter la noticeExporter en format RIS
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Identificateur de l’enregistrement70ef735f-8c1e-41f0-a2ba-134054fd0067
Enregistrement créé2020-04-08
Enregistrement modifié2020-05-08
Date de modification :